[gparted] Rename CI jobs to reflect that they use a CentOS Docker image (!4)

[Curtis Gedak <gedakc src gnome org>]

commit a6b0a26c7428076e26f08d32e73f5e0a7baf209a
Author: Mike Fleetwood <mike fleetwood googlemail com>
Date:   Fri Jun 22 22:06:39 2018 +0100

    Rename CI jobs to reflect that they use a CentOS Docker image (!4)
    
    Ready for adding additional Continuous Integration jobs using different
    distribution Docker images.  Rename thus:
        build -> centos_build
        test  -> centos_test
    
    Closes !4 - Add GitLab CI jobs to build and test GParted

 .gitlab-ci.yml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index ebc920e5..6597791c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -12,7 +12,7 @@ stages:
   - test
 
 # Check GParted can be built and installed.
-build:
+centos_build:
   stage: build
   script:
     - ./autogen.sh
@@ -20,7 +20,7 @@ build:
     - make install
 
 # Check GParted unit tests and distcheck pass.
-test:
+centos_test:
   stage: test
   script:
     - ./autogen.sh